Miles b



(No Model.)

. M.- B. DODGE.

BOOK ORUSHER. No. 273,478. Patented M21126, 1883.

D OQOGOOOOO OOOQ OOOO O O'OO r i y NITED STATES PATENT Erica.

ROCK-CRUSH ER.

SPECIFICATION forming part of Letters Patent No. 273,478, dated March 6,1883.

ApplioationfiledOctoberlS,1882. (NomodeL) To all whom it may concern:

Be it known that I, MILES B. DODGE, of the city and county of SanFrancisco, State of California, have invented an Improved Rock- Orusher;and I hereby declare the following to be afull, clear, and exactdescription thereof.

My invention relates to certain improve ments in that class of machinesused for crushing or breaking rock in which two jaws are employed toreceive the rock between them, and-are made to approach and recedealter-' nately by suitable operating mechanism, which is connected withone or both jaws.

My invention consists in the combination, with the pivotedand stationarycrushing-jaws, of peculiar dies constructed of relatively soft metal,and having hard-steel plugs embedded in them, as fully hereinafterexplained.

Figure 1 is a view of a machine having my improved dies. Fig. 2 is aface View of one of the dies.

A B are two jaws inclined toward each other, so that there is ahopper-shaped space between them, approaching or becoming liarrowertoward the bottom. In the present case, I have shown one of the jawsfixed and the other movable. The movable one is caused to alternatelyapproach to and recede from the fixed one by suitable mechanism, asshown. In order to provide faces for these jaws to protect them from theabrading action of the rock, I employ dies 0, which are preferably madeof wrought-iron and are secured to the j aw-plates by bolts 1). Thecrushing-surfaces of these jaws are bored full of holes, which, however,do

not extend entirely through, but are made deep enough to receive thesteel plugs E, which are driven in so as to be flush with the surface,and they are near enough together to receive the greater part of thepressure of the rock which is being crushed. By this construction thefaces of the dies are preserved from too rapid wear, and the crushing ismore effectively done.

I am aware that a cast-iron runner for an ore-mill has been providedwith hard metal strips set into it flush with its face; and I do notclaim this feature, my device being adapted for use in connection withthe pivoted jaw of a rock-breaker, and itis to this purpose I intend toconfine it.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a rock-crushing machine, the combination of the stationaryjaw A andthe pivoted jaw B, adapted to operate in connection therewith,

with the dies 0, adapted to be attached to the faces of suchjaws, suchdies being constructed of iron and having steel plugs embedded therein,so that their outer faces shall be flush with the-outer faces of thesaid dies.

' In witness whereof I hereunto set my hand.

MILES B. DODGE.

Witnesses! J. E. HAMILL, JAMES SMILEY.

